--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/shared/vmGCOperations.hpp Wed May 13 15:16:06 2015 +0200
@@ -0,0 +1,246 @@
+/*
+ * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHARED_VMGCOPERATIONS_HPP
+#define SHARE_VM_GC_SHARED_VMGCOPERATIONS_HPP
+
+#include "gc/shared/collectedHeap.hpp"
+#include "memory/heapInspection.hpp"
+#include "prims/jvmtiExport.hpp"
+#include "runtime/handles.hpp"
+#include "runtime/jniHandles.hpp"
+#include "runtime/synchronizer.hpp"
+#include "runtime/vm_operations.hpp"
+
+// The following class hierarchy represents
+// a set of operations (VM_Operation) related to GC.
+//
+// VM_Operation
+// VM_GC_Operation
+// VM_GC_HeapInspection
+// VM_GenCollectFull
+// VM_GenCollectFullConcurrent
+// VM_ParallelGCSystemGC
+// VM_CollectForAllocation
+// VM_GenCollectForAllocation
+// VM_ParallelGCFailedAllocation
+// VM_GC_Operation
+// - implements methods common to all classes in the hierarchy:
+// prevents multiple gc requests and manages lock on heap;
+//
+// VM_GC_HeapInspection
+// - prints class histogram on SIGBREAK if PrintClassHistogram
+// is specified; and also the attach "inspectheap" operation
+//
+// VM_CollectForAllocation
+// VM_GenCollectForAllocation
+// VM_ParallelGCFailedAllocation
+// - this operation is invoked when allocation is failed;
+// operation performs garbage collection and tries to
+// allocate afterwards;
+//
+// VM_GenCollectFull
+// VM_GenCollectFullConcurrent
+// VM_ParallelGCSystemGC
+// - these operations preform full collection of heaps of
+// different kind
+//
+
+class VM_GC_Operation: public VM_Operation {
+ protected:
+ BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL)
+ uint _gc_count_before; // gc count before acquiring PLL
+ uint _full_gc_count_before; // full gc count before acquiring PLL
+ bool _full; // whether a "full" collection
+ bool _prologue_succeeded; // whether doit_prologue succeeded
+ GCCause::Cause _gc_cause; // the putative cause for this gc op
+ bool _gc_locked; // will be set if gc was locked
+
+ virtual bool skip_operation() const;
+
+ // java.lang.ref.Reference support
+ void acquire_pending_list_lock();
+ void release_and_notify_pending_list_lock();
+
+ public:
+ VM_GC_Operation(uint gc_count_before,
+ GCCause::Cause _cause,
+ uint full_gc_count_before = 0,
+ bool full = false) {
+ _full = full;
+ _prologue_succeeded = false;
+ _gc_count_before = gc_count_before;
+
+ // A subclass constructor will likely overwrite the following
+ _gc_cause = _cause;
+
+ _gc_locked = false;
+
+ _full_gc_count_before = full_gc_count_before;
+ // In ParallelScavengeHeap::mem_allocate() collections can be
+ // executed within a loop and _all_soft_refs_clear can be set
+ // true after they have been cleared by a collection and another
+ // collection started so that _all_soft_refs_clear can be true
+ // when this collection is started. Don't assert that
+ // _all_soft_refs_clear have to be false here even though
+ // mutators have run. Soft refs will be cleared again in this
+ // collection.
+ }
+ ~VM_GC_Operation();
+
+ // Acquire the reference synchronization lock
+ virtual bool doit_prologue();
+ // Do notifyAll (if needed) and release held lock
+ virtual void doit_epilogue();
+
+ virtual bool allow_nested_vm_operations() const { return true; }
+ bool prologue_succeeded() const { return _prologue_succeeded; }
+
+ void set_gc_locked() { _gc_locked = true; }
+ bool gc_locked() const { return _gc_locked; }
+
+ static void notify_gc_begin(bool full = false);
+ static void notify_gc_end();
+};
+
+
+class VM_GC_HeapInspection: public VM_GC_Operation {
+ private:
+ outputStream* _out;
+ bool _full_gc;
+ bool _csv_format; // "comma separated values" format for spreadsheet.
+ bool _print_help;
+ bool _print_class_stats;
+ const char* _columns;
+ public:
+ VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
+ VM_GC_Operation(0 /* total collections, dummy, ignored */,
+ GCCause::_heap_inspection /* GC Cause */,
+ 0 /* total full collections, dummy, ignored */,
+ request_full_gc) {
+ _out = out;
+ _full_gc = request_full_gc;
+ _csv_format = false;
+ _print_help = false;
+ _print_class_stats = false;
+ _columns = NULL;
+ }
+
+ ~VM_GC_HeapInspection() {}
+ virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
+ virtual bool skip_operation() const;
+ virtual void doit();
+ void set_csv_format(bool value) {_csv_format = value;}
+ void set_print_help(bool value) {_print_help = value;}
+ void set_print_class_stats(bool value) {_print_class_stats = value;}
+ void set_columns(const char* value) {_columns = value;}
+ protected:
+ bool collect();
+};
+
+class VM_CollectForAllocation : public VM_GC_Operation {
+ protected:
+ size_t _word_size; // Size of object to be allocated (in number of words)
+ HeapWord* _result; // Allocation result (NULL if allocation failed)
+
+ public:
+ VM_CollectForAllocation(size_t word_size, uint gc_count_before, GCCause::Cause cause)
+ : VM_GC_Operation(gc_count_before, cause), _result(NULL), _word_size(word_size) {}
+
+ HeapWord* result() const {
+ return _result;
+ }
+};
+
+class VM_GenCollectForAllocation : public VM_CollectForAllocation {
+ private:
+ bool _tlab; // alloc is of a tlab.
+ public:
+ VM_GenCollectForAllocation(size_t word_size,
+ bool tlab,
+ uint gc_count_before)
+ : VM_CollectForAllocation(word_size, gc_count_before, GCCause::_allocation_failure),
+ _tlab(tlab) {
+ assert(word_size != 0, "An allocation should always be requested with this operation.");
+ }
+ ~VM_GenCollectForAllocation() {}
+ virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
+ virtual void doit();
+};
+
+// VM operation to invoke a collection of the heap as a
+// GenCollectedHeap heap.
+class VM_GenCollectFull: public VM_GC_Operation {
+ private:
+ int _max_level;
+ public:
+ VM_GenCollectFull(uint gc_count_before,
+ uint full_gc_count_before,
+ GCCause::Cause gc_cause,
+ int max_level)
+ : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */),
+ _max_level(max_level) { }
+ ~VM_GenCollectFull() {}
+ virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
+ virtual void doit();
+};
+
+class VM_CollectForMetadataAllocation: public VM_GC_Operation {
+ private:
+ MetaWord* _result;
+ size_t _size; // size of object to be allocated
+ Metaspace::MetadataType _mdtype;
+ ClassLoaderData* _loader_data;
+ public:
+ VM_CollectForMetadataAllocation(ClassLoaderData* loader_data,
+ size_t size, Metaspace::MetadataType mdtype,
+ uint gc_count_before,
+ uint full_gc_count_before,
+ GCCause::Cause gc_cause)
+ : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true),
+ _loader_data(loader_data), _size(size), _mdtype(mdtype), _result(NULL) {
+ }
+ virtual VMOp_Type type() const { return VMOp_CollectForMetadataAllocation; }
+ virtual void doit();
+ MetaWord* result() const { return _result; }
+
+ bool initiate_concurrent_GC();
+};
+
+class SvcGCMarker : public StackObj {
+ private:
+ JvmtiGCMarker _jgcm;
+ public:
+ typedef enum { MINOR, FULL, OTHER } reason_type;
+
+ SvcGCMarker(reason_type reason ) {
+ VM_GC_Operation::notify_gc_begin(reason == FULL);
+ }
+
+ ~SvcGCMarker() {
+ VM_GC_Operation::notify_gc_end();
+ }
+};
+
+#endif // SHARE_VM_GC_SHARED_VMGCOPERATIONS_HPP